Welcome Randy! I'm sorry to see that your first few posts have sparked controversy, and I hope it doesn't spook you off from this board. You have a gorgeous betta there, and while we may be coming off as pushy, the people on this forum really have the best interests of you and your fish at heart.
Pet stores care very little about the mental and physical wellbeing of the fish they sell. Bettas are the ultimate disposeable pet, and are often kept in undersized aquariums due to their unique ability to breath air. This aparatus has helped the species to survive summer dry spells in their natural habitat, where their living space is sometimes reduced to mere puddles. However, during the majority of the year, rice paddies are spacious despite being shallow, and the water is far from the filthy mudpuddles many pet stores purport bettas "enjoy" living in. In fact, many of the other betta species live in streams, ponds, and swamps just like any other fish.
The point of all this? Well, frankly, bettas were never meant to spend their entire lives in such cramped quarters. As with any animal, it leads a build-up of waste, inadequate exersize (which weakens the body as a whole), and of course, boredom. Additionally, since bettas are aquatic, the small amount of water prevents adequate heating, leads to fluctuating temperatures, and contributes to the build-up of fatal levels of ammonia. So, while a fish in a store cup might live long enough to be sold in such conditions, I can just about guarentee you that not a single betta kept in those unstable, unclean conditions would live even a fraction of their lifespan.
You've done the best you could with your knowledge of bettas by giving the animal a slightly larger living space. Most people do not know proper betta husbandry, so you can not be expected to, especially after being mislead by the store. However, you are now being educated, and instead of agreeing to look for something more suitable, you seem to be getting stand-offish. Please do not take offense to people's suggestions; the members here have been keeping bettas for years, and know what is best. A 1 gallon tank is a step in the right direction, though you still may find it difficult to heat. It will certainly allow your betta to be more active, and will slow the buildup of waste in the water, however.
If you think about it, it really isn't much space, even if it is a "mansion" compared to the cup you bought your fish in. Any other species would be allowed at least 1-3 gallons per inch of body length. The betta is a good 2-3 inches long, yet few will live in more than 1/2 gallon, because they are cursed by their unique air-breathing adaptation. Perhaps you think we are being silly because it is just a fish, and after all, you're living in cramped quarters... but please consider the fact that you are free to leave your apartment at any time, to go get exersize, visit new places, or even go out and buy a larger aquarium (hint
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). Your betta will never have this luxury. And, even if you did live only in the one bedroom apartment, you'd at least be able to crack a window when it got hot, turn on the heat when it got cold, and flush your urine and defecation instead of living in it and breathing it. In short, if you were at the mercy of a larger being, you'd probably want at least your minimum survival needs met, right? How can you do any less for a living creature that you've brought into your own home, then?
Please at least consider it. He's a beautiful fish; it'd be a shame to see him pass on early because of something as minor as 1/2 a gallon of water.
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